EM78P468NBQ EMC [ELAN Microelectronics Corp], EM78P468NBQ Datasheet - Page 43

• Manufacturer Part Number: EM78P468NBQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.2) 03.15.2005
(This specification is subject to change without further notice)
4.8 Int
T
his LSI has eight interrupt sources as listed below:
This IC has internal interrupts which are falling edge t
If these interrupt source
fl
RF is the interrupt status register. It records the interrupt request in
interrupt mask register. Global interrupt is enabled by ENI instruction and disabled by
DISI instruction. When one of the interrupts (when enabled) is generated, it will cause the
next instruction t
With this LSI, each individual interrupt source has its ow
Table 3. Before the interru
regist
ACC
interrupt service routine to be executed. So if other interrupts
interrupt service routine is bein
O
servi
errupt
ag to corresponding register if the IOCF0 register is enabled.
nly after he existin
ce routin
TCC overflow interrupt.
External interrupt P5.4/INTO pin
External interrupt P5.5/INT1 pin
Counter 1 underflow interrupt
Counter 2 underflow interrupt
Hig
Lo
Port 6, Port 8 input status change wake-up
TCC timer overflow interrupt,
F
er are initially saved by hardware. Afte
and R3 are restored. The existing inte
our
w-pu
h-pu
8-bits down c
t
lse width timer und
lse width timer und
e is executed
o be fetch from address 0003H~0018H according to interrupt source.
Fig. 14 Circuit 2 for the Residue Voltage Protection
g inte
s chang
ou
nter/timer underflow interrupt
.
pt subroutine is executed,
rrupt serv
e sign
erflow interrup
g executed, the hardware will save the later in
erflow interru
al from high to lo
ice routine
r the interrupt service routine is completed,
rrupt service routine does not allow other
pt
t
is comple
riggered or as follows:
w, the RF register will generate “1”
the contents of ACC and the R3
n interrupt vector as depicted in
ted that the next interrupt
occur while the existing
8-BIT Microcontroller
flag bit. IOCF0 is the
EM78P468N
terrupts.
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